Power Solutions International (OTC: PSIX) is an industrial engine and power systems manufacturer that designs, engineers, and assembles internal combustion engines and integrated power generation systems. Revenue comes from transactional product sales of engines and packaged power systems to OEM customers and direct end users across the power systems, industrial, and transportation markets. PSI sells both emission-certified compression ignition and spark-ignition engines capable of running on natural gas, propane, biofuels, gasoline, and diesel, with natural gas and alternative-fuel engines ranging from 0.99L to 53L displacement (per the FY2025 10-K). The company also designs large custom-engineered electrical power generation systems for standby and prime power applications. As of December 31, 2025, PSI carried $96.6 million in total outstanding debt and held $41.3 million in cash, with a revolving credit facility of up to $135.0 million maturing July 30, 2027. The company has a strategic collaboration agreement with Weichai, extended in March 2023 for three years, to expand market opportunities across geographies and end-user segments.

Revenue model

Transactional product sales of engines, packaged power systems, and custom-engineered electrical generation systems to OEM customers and direct end users. No subscription or royalty revenue model is described in the filing.

Products and services

Emission-certified spark-ignition and compression ignition internal combustion engines (0.99L to 53L displacement); fully packaged power systems including front accessory drives, cooling systems, electronic systems, air intake, fuel systems, exhaust, hydraulic systems, enclosures, telematics, and other componentry; large custom-engineered integrated electrical power generation systems for standby and prime power; battery packs for the industrial market. Engines are certified to run on natural gas, propane, biofuels, gasoline, and diesel. Heavy-duty natural-gas engines (32L, 40L, 53L) provide power output from 500 kWe to 1.25 MW.

Customers and end markets

OEM customers in power generation and industrial equipment manufacturing; direct end users. End markets include power systems, industrial, and transportation. The company has historically served the oil and gas market, though the filing notes sales levels may not return to prior highs due to lower rig counts. The filing does not disclose specific customer names or revenue concentration percentages.

Value-chain role

Vertically oriented designer and manufacturer. PSI sources engine blocks, internally designs and engineers products, performs in-house prototyping, testing, and application engineering, and assembles fully packaged power systems at its manufacturing facilities. Certified to ISO 9001:2015. Sells to OEMs and direct users, sitting between raw material suppliers and end-equipment manufacturers.

Geographic exposure

Domestic and global operations. The filing references compliance with U.S. federal, state, and non-U.S. laws across multiple jurisdictions, indicating international presence, but does not break out revenue by geography in the excerpts provided.

Source: SEC 10-K, filed 2026-03-02

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